EP1552465A1 - Appliance with an ic card reader and overload protection - Google Patents
Appliance with an ic card reader and overload protectionInfo
- Publication number
- EP1552465A1 EP1552465A1 EP03792290A EP03792290A EP1552465A1 EP 1552465 A1 EP1552465 A1 EP 1552465A1 EP 03792290 A EP03792290 A EP 03792290A EP 03792290 A EP03792290 A EP 03792290A EP 1552465 A1 EP1552465 A1 EP 1552465A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- card
- supply voltage
- vcc
- circuit
- overload
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0013—Methods or arrangements for sensing record carriers, e.g. for reading patterns by galvanic contacts, e.g. card connectors for ISO-7816 compliant smart cards or memory cards, e.g. SD card readers
- G06K7/0086—Methods or arrangements for sensing record carriers, e.g. for reading patterns by galvanic contacts, e.g. card connectors for ISO-7816 compliant smart cards or memory cards, e.g. SD card readers the connector comprising a circuit for steering the operations of the card connector
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0013—Methods or arrangements for sensing record carriers, e.g. for reading patterns by galvanic contacts, e.g. card connectors for ISO-7816 compliant smart cards or memory cards, e.g. SD card readers
Definitions
- the present invention relates to an appliance having an IC card reader for operation with an IC card.
- Appliances of this kind are known for example from pay television broadcast (pay TV) , electronic payment, or banking services .
- IC cards also known as smart cards, are portable information media, having the size of about a credit card. They comprise an integrated card controller, or at least an integrated memory, for a data exchange with a respective appliance.
- a portable device of this kind is known for example from EP-A-0 633 544.
- IC card As a general term for this data media the expression "IC card” will be used throughout in this description. IC cards are usually provided with contacts being mechanically contacted by an IC card reader for an electrical connection for the data exchange with the respective appliance.
- IC cards The communication between IC cards and respective appliances with IC card readers is described for example in WO 97/25685 and EP-A-0 814 427.
- An international standard which describes and defines IC cards having contacts and the operation procedures of IC cards, is ISO/IEC 7816- 3: 1997(E) . This standard is used particularly for pay television systems, which use a set-top box or a digital satellite receiver with an IC card reader and respective IC cards for authorizing the reception of pay television broadcasts.
- the respective IC cards comprise data, which enable the set-top box to unscramble received coded video signals .
- An overcurrent protection circuit for a power supply providing an IC card with power is disclosed in US 5,977,758.
- This circuit comprises a current detection circuit, which switches in case of a malfunction the power to the IC card off independently of a micro-controller.
- the appliance comprises an IC card reader for an operation with an IC card and a power supply for providing a supply voltage, in particular for the IC card reader.
- the appliance comprises further an overload protection circuit, which simulates an. IC card extraction in case of an overload of the supply voltage. The power supply is then immediately switched off to avoid any damage for the power supply.
- the IC card reader is equipped with a card presence switch for indicating to a microcontroller of the appliance, that an IC card has been inserted into the card reader.
- the micro-controller provides then a control signal for switching on the power supply for the operation with the IC card. Power to the IC card is therefore only provided, when a signal of the card presence switch indicates that an IC card has been inserted.
- the overload protection circuit changes the positive signal of the card presence switch to a value, which states that no IC card is present. Therefore, an extraction of the IC card is simulated.
- the overload protection circuit is coupled between the supply voltage for the IC card and the signal line of the card presence switch and provides a detection of a short circuit.
- the protection circuit may comprise a diode, a comparator or a transistor, which resets the value of the card presence switch to a value, which simulates that no IC card is present.
- a logic circuit is used, to control the switching on and off of the power supply for the IC card.
- the card presence signal and the power on/off signal from the micro-controller are coupled and the operation of the logic circuit is such, that the power supply is only switched on, when an IC card is inserted applying a positive signal from the card presence switch to the logic circuit, and when the micro-controller provides the command signal for switching on the supply voltage.
- the logic circuit switches through for turning the power to the IC card on.
- the logic circuit is for example an AND circuit or a NAND circuit. When a short circuit occurs, the power to the IC card is immediately switched off via the logic circuit, independently from the microcontroller. The power is therefore switched off much faster, as could be performed by the micro-controller, which reduces the danger of damaging the power supply.
- Fig. 1 An appliance with an IC card reader and an overload protection circuit
- Fig. 2 an appliance with an IC card reader comprising a protection circuit against a short circuit .
- the appliance shown in Fig. 1 comprises an IC card reader 3, which is powered by a power supply 4 via line 8.
- the IC card reader 3 comprises in particular a housing, in which a respective IC card can be inserted, and contact terminals for applying a supply voltage VCC to the IC card and for providing an exchange of digital data between the IC card and a micro-controller 5 of the appliance.
- the card reader 3 comprises further a card presence switch 2, which provides a signal "CARD-DET" via a signal line 7 to the micro-controller 5, when an IC card is inserted.
- the card presence switch 2 is a mechanical switch, which is operated, when an IC card is inserted. If an IC card is inserted, the switch 2 is opened. Via a respective circuitry, as explained with regard to Fig. 2, a logical "HIGH" signal, "CARD-DET", is provided then to the microcontroller 5.
- an overload protection circuit 6 is coupled between the line 8 of the supply voltage VCC and the line 7 of the card detect signal, which converts in case of an overload of the supply voltage VCC the signal indicating the presence of an inserted IC card to a value, which states that no IC card is present.
- the overload of the supply voltage VCC simulates therefore via the protection circuit 6 an IC card extraction for switching off the power supply 4.
- the power supply 4 in this embodiment is switched on and off by a logic circuit IC3, to which inputs the signal from the card presence switch 2 "CARD-DET” is applied and the power on/off signal "CMD-VCC” from the micro-controller 5.
- the power supply 4 is then switched on only, when a positive signal from the card presence switch 2 is provided and a power on command from the micro-controller 5.
- the protection circuit 6 converts the signal from ' the card presence switch 2 from "CARD DETECTED” to "NO CARD PRESENT", and therefore switches off the power supply 4 immediately via the logic circuit IC3.
- the logic circuit IC3 is for example a NAND or an AND circuit.
- the protection circuit 6 may comprise an over-current protection circuit, which measures the current of line 8 for example via a measuring resistor, and which provides a respective signal for an overload, when the current provided by the power supply 4 is too high.
- the protection circuit 6 comprises a voltage detector for the supply voltage VCC, which uses a voltage threshold for determining a breakdown of the supply voltage VCC. This can be performed for example by a protection circuit comprising a comparator, a transistor or a diode, or by any other switching element. A supply voltage breakdown occurs for example in case of a short circuit .
- a detail of a digital set-top box comprising an IC card reader 3 and relevant parts for the operation of the set-top box with an IC card.
- the IC card reader 3 comprises an IC card connector 1 with contacts CI - C8, for operation with an IC card according to the IEC 7816-3:1997 (E) standard.
- the contacts CI - C8 provide the following connections to an IC card: CI for supply voltage VCC, C2 for a reset of the IC card, C3 for providing a clock signal C K to the IC card, C4 , C5 and C8 for providing ground terminal connections to the IC card, C6 (reserved for a programming voltage VPP) and C7 for providing a data input/output connection for a data exchange between the IC card and the set-top box.
- the set-top box comprises further an integrated circuit ICl, a buffer and line driver for the digital signals used for operation with the IC card.
- the respective signals which are coupled to the integrated circuit 1, are the reset signal “RESET-CARD” for contact C2 , the clock signal “CLK-CARD” for contact C3 , and data input and output signals "DOUT” and "DIN” for contact C7.
- the integrated circuit ICl is for example an integrated circuit 74HCT244 from Texas Instruments ' .
- a supply voltage of 5 Volts is used for the ICl, also for the IC card and the electronics of the IC card reader 4, a supply voltage of 5 Volts is used.
- the IC card reader 3 comprises a card presence switch 2 with switch contacts SW for a detection of an IC card, when an IC card is inserted into the IC card connector 1.
- a supply voltage of 5 V is coupled via a resistor Rl .
- the switch contacts SW are open.
- a transistor Tl is coupled via its base terminal to the switch contact PRES. The transistor Tl provides therefore a "LOW" output signal, when the switch 2 is open, (IC card inserted) and a "HIGH” output signal, when the switch 2 is closed.
- a NAND circuit IC2 is coupled, which is arranged as an inverter, for providing a signal "CARD- DET" for a micro-controller, not shown in Fig. 2, of the set-top box.
- the micro-controller is for example a "system- on-chip” controller STI5516 from ST Microelectronics.
- the output signal of the NAND circuit IC2 is therefore "HIGH", when an IC card is inserted.
- the output of IC2 is also coupled to an input of a NAND circuit IC3 , for providing a supply voltage VCC to the IC card, terminal CI .
- a control signal "CMD- VCC" from the micro-controller is coupled.
- the micro-controller provides the signal "CMD-VCC” for switching on the supply voltage VCC for the IC card.
- the supply voltage VCC is provided by a transistor T2 , to which base terminal the output of IC3 is coupled.
- transistor T2 switches through for supplying a 5 V supply voltage VCC to the contact CI of the IC card connector 1.
- a diode Dl is coupled, which is arranged such, that the diode Dl conducts, when the signal from the switch contact is "HIGH", but the supply voltage VCC is low. Therefore, when the supply voltage VCC breaks down when an IC card is inserted, for example when the IC card has a short circuit between respective IC card contacts, the diode Dl switches through and therefore switches off transistor Tl . Then the output of NAND circuit IC2 switches to "LOW", which switches off immediately the transistor T2 via NAND circuit IC3.
- the transistor T2 the power supply for the IC card, is switched off therefore immediately by transistor Tl and NAND circuits IC2 and IC3, and will not be damaged by a short circuit. There is a much smaller delay, as would be the case when the transistor T2 would be switched off via the micro-controller.
- the diode Dl provides therefore a very effective short circuit protection.
- buffer/line driver circuits with a controllable output can be used, for example integrated circuits Quad buffer/line driver 74HC125 or 74HC126, manufactured for example from Philips Semiconductors. These circuits comprise four non-inverting buffers, which outputs are controllable via a respective output enable input, the 74HC125 having active LOW enable inputs and the 74HC126 active HIGH enable inputs.
- the overload protection circuit 6, Fig. 1 may be arranged also within a power supply circuit, which provides then an error signal in case of an overload.
- a power supply circuit which provides then an error signal in case of an overload.
- an adjustable power voltage regulator LP2951 from Fairchild Semiconductor Corporation can be used, which provides an error signal in case of a low output voltage, which may occur for example in case of a short.
- the IC LP2951 is switched on and off via the signal CMD-VCC from microcontroller 5, see Fig. 1.
- the error signal from IC LP2951 can be applied for example to the output enable input of a buffer/line driver circuit, IC 74HC125, to which input the card detected signal CARD- DET, Fig. 1, is coupled, and which output is coupled to IC3 and to the micro-controller 5.
- the error signal from IC LP2951 then changes the output from the buffer/line driver circuit from positive to negative, simulating therefore an IC card extraction, which switches off the power supply 4 via IC3.
- the overload protection as described is especially suited for a digital set-top box or a satellite receiver operating with an IC card, but applications for other appliances having an IC card reader for operation with an IC card are also possible.
- the appliance may have also further IC card readers, which are protected in the same way.
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- General Engineering & Computer Science (AREA)
- Power Sources (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03792290A EP1552465B1 (en) | 2002-08-21 | 2003-08-08 | Appliance with an ic card reader and overload protection |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02292063A EP1391840A1 (en) | 2002-08-21 | 2002-08-21 | Appliance with an IC card reader and overload protection |
EP02292063 | 2002-08-21 | ||
PCT/EP2003/008877 WO2004019259A1 (en) | 2002-08-21 | 2003-08-08 | Appliance with an ic card reader and overload protection |
EP03792290A EP1552465B1 (en) | 2002-08-21 | 2003-08-08 | Appliance with an ic card reader and overload protection |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1552465A1 true EP1552465A1 (en) | 2005-07-13 |
EP1552465B1 EP1552465B1 (en) | 2009-10-21 |
Family
ID=30775893
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02292063A Withdrawn EP1391840A1 (en) | 2002-08-21 | 2002-08-21 | Appliance with an IC card reader and overload protection |
EP03792290A Expired - Fee Related EP1552465B1 (en) | 2002-08-21 | 2003-08-08 | Appliance with an ic card reader and overload protection |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02292063A Withdrawn EP1391840A1 (en) | 2002-08-21 | 2002-08-21 | Appliance with an IC card reader and overload protection |
Country Status (10)
Country | Link |
---|---|
US (1) | US7216809B2 (en) |
EP (2) | EP1391840A1 (en) |
JP (1) | JP4567451B2 (en) |
KR (1) | KR100998211B1 (en) |
CN (1) | CN100337242C (en) |
AU (1) | AU2003253401A1 (en) |
DE (1) | DE60329775D1 (en) |
MX (1) | MXPA05001577A (en) |
WO (1) | WO2004019259A1 (en) |
ZA (1) | ZA200500733B (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101169816B (en) * | 2006-10-26 | 2011-05-25 | 北京华旗资讯数码科技有限公司 | Electronic card protection circuit |
US20110267190A1 (en) * | 2010-05-03 | 2011-11-03 | Irvine Sensors Corporation | Anti-Tampering Detection Using Target Circuit RF Signature |
US8649820B2 (en) * | 2011-11-07 | 2014-02-11 | Blackberry Limited | Universal integrated circuit card apparatus and related methods |
US8936199B2 (en) | 2012-04-13 | 2015-01-20 | Blackberry Limited | UICC apparatus and related methods |
US10380471B2 (en) * | 2013-07-23 | 2019-08-13 | Capital One Services, Llc | Dynamic transaction card power management |
US9619792B1 (en) | 2014-03-25 | 2017-04-11 | Square, Inc. | Associating an account with a card based on a photo |
CN105100303A (en) * | 2014-05-22 | 2015-11-25 | 中兴通讯股份有限公司 | Power supply protecting device and terminal equipment |
US9679234B2 (en) * | 2014-07-01 | 2017-06-13 | Square, Inc. | Charging card using power harvested from reader |
US10296910B1 (en) | 2014-08-08 | 2019-05-21 | Square, Inc. | Pay-by-name payment check-in with a payment card |
US10304053B1 (en) | 2014-08-08 | 2019-05-28 | Square, Inc. | Shopping check-out with a payment card |
US10614450B1 (en) | 2014-08-08 | 2020-04-07 | Squre, Inc. | Controlled emulation of payment cards |
CN104464783A (en) * | 2014-12-18 | 2015-03-25 | 江苏天安智联科技股份有限公司 | Car-mounted memory card interface short-circuit protection device |
WO2016168423A1 (en) | 2015-04-14 | 2016-10-20 | Capital One Services, LLC. | Tamper-resistant dynamic transaction card and method of providing a tamper-resistant dynamic transaction card |
CN108256364B (en) * | 2017-12-29 | 2020-12-29 | 浙江大华汽车技术有限公司 | IC card hot plug detection circuit |
CN112067976A (en) * | 2020-09-18 | 2020-12-11 | 无锡翼盟电子科技有限公司 | Be used for printing apparatus consumptive material chip to prevent high voltage breakdown circuit |
CN112288068B (en) * | 2020-10-24 | 2024-02-27 | 卓捷创芯科技(深圳)有限公司 | Positive feedback latch amplitude limiting control circuit and method for passive radio frequency identification tag |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS62105293A (en) * | 1985-10-31 | 1987-05-15 | Toshiba Corp | Reading/writing device for portable recording medium |
JPS62114085A (en) * | 1985-11-13 | 1987-05-25 | Nippon Telegr & Teleph Corp <Ntt> | Protecting circuit for ic card |
JPH0255355U (en) * | 1988-10-11 | 1990-04-20 | ||
US5790946A (en) * | 1993-07-15 | 1998-08-04 | Rotzoll; Robert R. | Wake up device for a communications system |
AU702183B2 (en) * | 1995-03-22 | 1999-02-18 | Framatome Connectors International | Reading frame for a microcircuit card reader apparatus |
JP3573350B2 (en) * | 1995-12-22 | 2004-10-06 | トムソン コンシユーマ エレクトロニクス インコーポレイテツド | Smart card reader and method for protecting smart card with smart card reader |
JP3486057B2 (en) * | 1996-06-21 | 2004-01-13 | 株式会社東芝 | Semiconductor integrated circuit and contact IC card |
JPH10243544A (en) * | 1997-02-27 | 1998-09-11 | Toshiba Corp | Protective circuit against overcurrent and, method of protection by protective circuit against overcurrent |
KR19980081575A (en) * | 1997-04-21 | 1998-11-25 | 윤종용 | Smart card with adjustable level of external input voltage |
US5963144A (en) * | 1997-05-30 | 1999-10-05 | Single Chip Systems Corp. | Cloaking circuit for use in a radiofrequency identification and method of cloaking RFID tags to increase interrogation reliability |
JPH11154137A (en) * | 1997-11-20 | 1999-06-08 | Hitachi Ltd | Individual work environment setting system |
US6484946B2 (en) * | 1997-12-22 | 2002-11-26 | Hitachi, Ltd. | IC card information display device and IC card for use therewith |
EP0953936B1 (en) * | 1998-02-17 | 2001-05-09 | Infineon Technologies AG | Data carrier for use either with or without contact |
US6318632B1 (en) * | 1998-07-30 | 2001-11-20 | Airborn, Inc. | Smart card reader with electrostatic discharge protection |
FR2795881B1 (en) * | 1999-06-30 | 2001-08-31 | St Microelectronics Sa | CIRCUIT FOR PRODUCING A HIGH VOLTAGE PROGRAMMING OF A MEMORY |
JP2002222391A (en) * | 2001-01-29 | 2002-08-09 | Matsushita Electric Ind Co Ltd | Device and method for managing memory card |
JP2002231344A (en) * | 2001-02-02 | 2002-08-16 | Jst Mfg Co Ltd | Connector for flash memory card |
US7293710B2 (en) * | 2004-04-03 | 2007-11-13 | Alcor Micro, Corp. | Method of overcurrent protection for multi-slot flash memory card reader |
-
2002
- 2002-08-21 EP EP02292063A patent/EP1391840A1/en not_active Withdrawn
-
2003
- 2003-08-08 KR KR1020057002763A patent/KR100998211B1/en active IP Right Grant
- 2003-08-08 AU AU2003253401A patent/AU2003253401A1/en not_active Abandoned
- 2003-08-08 DE DE60329775T patent/DE60329775D1/en not_active Expired - Lifetime
- 2003-08-08 MX MXPA05001577A patent/MXPA05001577A/en active IP Right Grant
- 2003-08-08 JP JP2004530119A patent/JP4567451B2/en not_active Expired - Fee Related
- 2003-08-08 CN CNB038197375A patent/CN100337242C/en not_active Expired - Fee Related
- 2003-08-08 US US10/525,056 patent/US7216809B2/en not_active Expired - Lifetime
- 2003-08-08 EP EP03792290A patent/EP1552465B1/en not_active Expired - Fee Related
- 2003-08-08 WO PCT/EP2003/008877 patent/WO2004019259A1/en active Application Filing
-
2006
- 2006-01-25 ZA ZA200500733A patent/ZA200500733B/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2004019259A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE60329775D1 (en) | 2009-12-03 |
JP2006505028A (en) | 2006-02-09 |
WO2004019259A1 (en) | 2004-03-04 |
CN100337242C (en) | 2007-09-12 |
AU2003253401A1 (en) | 2004-03-11 |
US7216809B2 (en) | 2007-05-15 |
JP4567451B2 (en) | 2010-10-20 |
CN1675647A (en) | 2005-09-28 |
KR20050058354A (en) | 2005-06-16 |
EP1552465B1 (en) | 2009-10-21 |
ZA200500733B (en) | 2006-03-29 |
MXPA05001577A (en) | 2005-04-25 |
KR100998211B1 (en) | 2010-12-07 |
EP1391840A1 (en) | 2004-02-25 |
US20050247785A1 (en) | 2005-11-10 |
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